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Multifunctional Sn- and Fe-Codoped In2O3 Colloidal Nanocrystals: Plasmonics and Magnetism.

Authors
  • Tandon, Bharat
  • Shanker, G Shiva
  • Nag, Angshuman
Type
Published Article
Journal
The Journal of Physical Chemistry Letters
Publisher
American Chemical Society
Publication Date
Jul 03, 2014
Volume
5
Issue
13
Pages
2306–2311
Identifiers
DOI: 10.1021/jz500949g
PMID: 26279551
Source
Medline
Keywords
License
Unknown

Abstract

We prepared Fe- and Sn-codoped colloidal In2O3 nanocrystals (∼6 nm). Sn doping provides free electrons in the conduction band, originating localized surface plasmon resonance (LSPR) and electrical conductivity. The LSPR band can be tuned between 2000 and >3000 nm, depending on the extent and kind of dopant ions. Fe doping, on the other hand, provides unpaired electrons, resulting in weak ferromagnetism at room temperature. Fe doping shifts the LSPR band of 10% Sn-doped In2O3 nanocrystals to a longer wavelength along with a reduction in intensity, suggesting trapping of charge carriers around the dopant centers, whereas Sn doping increases the magnetization of 10% Fe-doped In2O3 nanocrystals, probably because of the free electron mediated interactions between distant magnetic ions. The combination of plasmonics and magnetism, in addition to electronic conductivity and visible-light transparency, is a unique feature of our colloidal codoped nanocrystals.

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